Measure to show days in the month automatically

[AndreasA]

How can I make a column or measure that will automatically go to the calendar of 2016 and input the number of days in the month. So basically for every row in January I want it to have 31 days for 2016; February I want 29 days for 2016, etc.? 

[v-haibl-msft · Accepted solution]

@AndreasA

I assume you have a table as below and another calendar table.

You can create a column in Calendar table and a column in Table1 with following formula to get the result.

YearMonth = YEAR( 'Calendar'[Date] ) * 100 + MONTH( 'Calendar'[Date] )

MonthDays = 
VAR LastDayThisMonth =
    CALCULATE (
        MAX ( 'Calendar'[Date] ),
        ALLEXCEPT ( 'Calendar', 'Calendar'[YearMonth] )
    )
RETURN
( DAY ( LastDayThisMonth ) )

Best Regards,

Herbert

[Anonymous]

Hi. I tried doing the same thing but all I'm getting is each month has 31 days. How do I fix it? 

[KGrice]

So you already have a table with one row for each day, and you want a column to show how many days are in each row's month? The row for 1 Jan 2016 would have a Days In Month column that shows 31, and the row for 2 Jan 2016 would show the same, etc.

If that's the case, there are a few places you could do this. Done as a new column in the data modeling pane, it would be helpful if you have a Start Of Month column or some way to uniquely identify the months. With that in place, the new column would be

Days In Month = CALCULATE(COUNT('DateTable'[DateColumn]), FILTER('DateTable', 'DateTable[StartOfMonth]=EARLIER('DateTable'[StartOfMonth])))

[CheenuSing]

@AndreasA

The simplest way is to use the measure or column in the calendar table as

DaysInTheMonth = Day(LASTDATE('Calendar'[DateKey]))

So each row it will add the the number of days in that year and month.

Try it out.

If this works please accept this as a Solution and also give KUDOS.

Cheers

CheenuSing

[GilesWalker]

@AndreasA - I use this calculated column:

Total days = DAY(DATE(DateKey[Year],DateKey[Month number]+1,1)-1)

Giles

[Anonymous]

This worked perfectly for me! Simple. Thanks.